Rails 4. Which Two-Factor Authentication Solution Should You Choose?

Question

Ruby on Rails

Good afternoon,
Can you tell me which two-factor authentication system to use for a project on Rails 4?
Description:
I have registration of users and companies on the site. The company can grant the user the rights to perform operations. Generates a corporate password for this user. I need the user, when performing an operation on behalf of the Company, to receive a window with additional authorization.
Interesting approaches to the implementation of such a task, gems, articles on this topic.
Thanks for the answers

Answer 1

If I understand correctly, then this can be solved with the devise gem by creating an additional field (let's add a user role ) in the database and check for it when entering, while throwing out the extra. window. Everything is very flexible there.